Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.

1. Disconnect the panel dimmer switch connector.
2. Turn the headlight switch to the PARK position.
3. Connect a test lamp between terminal C and terminal D of the instrument panel dimmer switch harness connector.

Does the test lamp light?

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Go to Step 2

Go to Step 3

Connect a fused jumper between terminal B of the panel dimmer switch harness connector and ground.

Are the interior lamps lit?

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Go to Step 4

Go to Step 5

Repair the open in CKT 150 between the panel dimmer switch and the ground. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Interior Lights Dimming System Check

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Backprobe the lamp dimmer module connector with a fused jumper between terminal B and ground.

Do the interior lamps turn off?

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Go to Step 6

Go to Step 7

Replace the panel dimmer switch.

Is the repair complete?

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Go to Interior Lights Dimming System Check

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Repair the open or short to battery positive voltage in CKT 44 between the panel dimmer switch and the lamp dimmer module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Interior Lights Dimming System Check

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Replace the lamp dimmer module.

Is the repair complete?

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Go to Interior Lights Dimming System Check

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